Disabling Keyboard Keys

>Is there anyway that I can disable the command key during the playing
>of the movie ?

Sure, just use a piece of script that says something like:

   when keydown = COMMAND then dontPassEvent

then put the script wherever you don't want the COMMAND active. This will effectively "disable" the COMMAND key.

If you want to trap for other keys, eg OPTION, SHIFT, etc, etc. you can create a handler in your movie script in a manner similar to this:

when keyDown then doMyKey   --where doMyKey is a handler
 
on doMyKey
    if the key = SHIFT then go to "they whistle and they clip clop"
    else
    if the key = OPTION then go to "Heavenly Voices"
    else
    if the key = COMMAND then dontPassEvent
    else....                --you get the idea 
end doMyKey

You have to use a handler as the "when keydown" will only allow you to execute a single command. So just make the command a call to a handler and you're set.